VIMOS trending system: HISTORY plot
Last update: 2006-11-16T10:53:38 (UT)
same group: MEDIAN RMS RON   AVGLOW AVGHIGH
close window history: 2003 2004   2005   2006   2007 2008   HEALTH
  ... ... ...
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Plot Symbol
[info]		 Source* Average [info] Thresholds [info] N_data Data downloads Remarks
method value unit method value
1 •QC1DB MEDIAN1.220 ADU 3SIG0.067 49 this | last_yr | all Q2, rms of master, low gain, Garching values
2 •QC1DB MEDIAN1.340 ADU 3SIG0.551 49 this | last_yr | all Q1, rms of master, low gain, Garching values
3 •QC1DB MEDIAN3.260 ADU 3SIG0.036 50 this | last_yr | all Q2, rms of master, high gain, Garching values
4 •QC1DB MEDIAN8.410 ADU 3SIG44.357 49 this | last_yr | all Q1, rms of master, high gain, Garching values
5 •QC1DB MEDIAN1.820 ADU 3SIG16.887 49 this | last_yr | all Q3, rms of master, low gain, Garching values
6 •QC1DB MEDIAN1.110 ADU 3SIG0.055 49 this | last_yr | all Q4, rms of master, low gain, Garching values
7 •QC1DB MEDIAN23.370 ADU 3SIG37.792 50 this | last_yr | all Q3, rms of master, high gain, Garching values
8 •QC1DB MEDIAN3.220 ADU 3SIG0.426 49 this | last_yr | all Q4, rms of master, high gain, Garching values
*Data sources: OPSLOG: Paranal ops logs; QC1DB: QC1 database; LOCAL: local text file
This plot

Trending plots for bias QC parameters.

All bias parameters are measured in the central 1600x1800 pixels of the detectors. The median bias level and the rms of the master should show a stable trend without sudden jumps or increase/decrease. The read-out noise is calculated from the difference of the first two raw frames. Some outliers with high values are occasionally observed due to cosmic ray events.

Bias frames are usually measured daily during day-time. They come in two different varieties: with low gain (used for imaging) and with high gain (used to calibrate the spectroscopic modes).  

General information

Click on any of the plots to see a close-up version. The latest date is indicated on top of the plot, data points belonging to that date are specially marked.

If configured,

  • statistical averages are indicated by a solid line, and thresholds by broken lines
  • outliers are marked by a red asterisk. They are defined as data points outside the threshold lines
  • "aliens" (= data points outside the plot Y limits) are marked by a red arrow (↑ or ↓)
  • you can download the data for each parameter set if the 'Data downloads' link shows up